Free Period & Fertility Calculators

Free online tools to track your menstrual cycle, predict ovulation, and identify your fertile window. No signup required.

All Calculators

Choose a free tool to understand your cycle, fertility, and reproductive health.

Calculate your next period date in seconds. Enter your last menstrual period start date, hit calculate, done.

Find your ovulation date and 6-day fertile window in seconds.

See your fertile window and peak days to get pregnant.

See exactly which phase you're in today and what's coming next.

See your follicular phase dates, symptoms, and what to eat for optimal energy.

Estimate your next period and fertile window, even with irregular cycles.

Calculate your monthly period cycle and predict your next period date in seconds.

Find your exact ovulation day and peak fertility window based on your cycle data.

Calculate your safe days and unsafe days based on your menstrual cycle.

Find out exactly how many calories you need each day during pregnancy.

Predict your next period date with pinpoint accuracy, based on your actual cycle length.

Predict your next period date and understand your menstrual cycle in seconds.

Calculate your average period cycle length using your last few periods.

Predict your next period and menstrual cycle dates in seconds.

Find out which phase of your menstrual cycle you're in right now.

Estimate ovulation and your fertile window after miscarriage using your first real period date and average cycle length.

Estimate your implantation date and earliest pregnancy test window in seconds.

Estimate conception timing from the date you know.

Estimate your due date, current pregnancy week, and key milestones from your embryo transfer date and embryo age.